no real surface
sphere of buring gas
no atmosphere and no life
only planet to support life
medium-sized star
rotates on an axis
rotates on its axis every 24 hours
29 days to revolve around Earth
natural satellite
4 times larger than the moon
has water and atmosphere
a million times bigger than Earth
sphere of rock
surface scarred and cratered
source of heat and light for our solar system
3rd planet from the sun